This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A268141 #4 Jan 27 2016 05:32:27 %S A268141 0,3,8,672,5760,1411560,25024320,11908517040,361147852800 %N A268141 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one diagonal or antidiagonal neighbor and the top left element equal to 0. %C A268141 Column 4 of A268142. %e A268141 Some solutions for n=4 %e A268141 ..0..1..0..3....0..2..0..1....0..3..3..2....0..3..3..0....0..2..3..2 %e A268141 ..1..0..3..2....2..0..1..3....3..0..2..3....3..0..0..3....2..0..2..3 %e A268141 ..0..3..2..1....0..2..3..1....1..0..2..1....1..2..1..2....3..1..0..1 %e A268141 ..3..2..1..2....2..3..1..3....0..1..1..2....2..1..2..1....1..3..1..0 %Y A268141 Cf. A268142. %K A268141 nonn %O A268141 1,2 %A A268141 _R. H. Hardin_, Jan 27 2016